var msg = ["username", "email", "QQ", "number"];
var stdin = process.stdin;
var index = 0;
var infor = [];
console.log(msg[0]+":");

stdin.on("data", function(chunk){
    var str = chunk.toString("utf-8");
    infor[index] = str.substring(0, str.indexOf("\r\n"));
    index++;
    if(index == 4){
        for(var i=0; i<4; i++){
            console.log(msg[i]+":"+infor[i]);
        }
        process.exit();
    }
    console.log(msg[index]+":");
});